A torsion bars function is to act as a spring and the effective spring rate of the bar is determined by its fabrication material, shape, length, cross section, and the process by which it was manufactured.
扭力桿的功能是充當彈簧，並且桿的有效彈簧率取決於其製造材料、形狀、長度、橫截面和製造過程。

Essentially, it is just a long metal bar that is attached firmly to the a frame; the opposite end terminates in a lever, the torsion key, mounted perpendicular to the bar, that is attached to a suspension link, or the axle. In the case of a vehicle the vertical motion of the wheel causes the bar to twist around its axis and is resisted by the bar's torsional resistance.
本質上，它只是一根牢固地固定在框架上的長金屬棒；另一端終止於一個槓桿，即扭力鍵，垂直於桿安裝，連接到懸吊連桿或軸。對於車輛而言，車輪的垂直運動會導致桿繞其軸線扭轉，並受到桿的扭轉阻力的抵抗。

Keep in mind that torsion is the twisting of an object due to an applied torque.
扭轉是由於施加的扭矩而導致物體的扭曲。

Torsion Bar（扭杆）

Source: https://www.quora.com/What-is-a-torsion-bar-What-is-its-purpose-on-a-vehicle-How-does-it-work

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